Hello, we are a small soap company in the US. Currently we have a retail website and also sell off of Etsy. We are moving in to wholesaling to boutiques and different shops, and are creating a wholesale website. We've hit a roadblock when it comes to shipping costs for our product. We have many different shapes and sizes of soaps, which makes it difficult to have a flat rate. Normally we would ship larger quantities in a USPS Large Flat Rate Box, however the different combinations of soaps people could order may not fit in to a Large Flat Rate. Should we integrate a shopping cart in to calculate shipping costs based on weight and customer's location? Any suggestions on how to handle pricing our shipping for wholesale? Thank you.